Envelope for a light bulb



FIG. 1is an elevational view of a first side of the envelope of the invention;

FIG. 2 is an elevational view of a second side of the envelope of the invention rotated 90 degrees;

FIG. 3 is a plan view of the envelope of the invention; and,

FIG. 4 is a top view of the envelope of the invention.

The elements for which the design is claimed are shown in solid lines. 

The ornamental design for an envelope for a light bulb, substantially as shown and described. 